Illustration of a septagonal bipyramid. A bipyramid, or dipyramid, is formed by joining two congruent pyramids at their bases. The bases in this illustration are heptagons/septagons.

Septagonal/Heptagonal Bipyramid

Illustration of a septagonal bipyramid. A bipyramid, or dipyramid, is formed by joining two congruent…